Beautiful photo Kathy.
I agree, it looks like a juvenile Cooper's Hawk (tail feathers do look tapered in the one photo).
They are the reason I have my banties and grow out chicks under hawk netting behind heavy wire 24x7.
If I let a chick free range before 8 to 10 weeks of age, or let my banties out at all, I soon come out to a pile of feathers or a missing chick.
I've seen them swoop down and pick 4 week old chicks off the ground and fly out.
My larger banties they kill and eat at site.
I missed him this year, but for several years after building the broody hutch/grow out pen, I had a Cooper's sit on the fence post staring into the grow out at all the tasty nuggets he couldn't get to.
You can't do anything about them in Oregon (or in the USA, for that matter)...I go out with pots and pans and scare them away, hang as much hawk netting as I can, have a small rat terrier to make noise. I get maybe a bird lost a year now instead of 1 or 2 a month...chicks as soon as I let them out.
Beautiful birds. Amazing fliers.
LofMc